Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
If you're going to be thinking of nothing else for the next few days, it might be worth getting checked out, just for your own peace of mind. Or, maybe, put off that 5-miler for another yet. Although, if you do decide to run, I'll be cheering you from CO!